Bus support



Feb. 17, 1931. w SIMAYER 1,793,430

BUS SUPPORT Filed Aug. 29, 1925 IN V EN TOR.

L Wzzer S215 e7; B

A TTORNEYS.

Patented Feb. 17, 1931 UNITED STATES PATENT OFFICE BUS SUPPORT Application filed August 29, 1925. Sgrial No; 53,252.

My invention is an improved support for carrying and insulating a bus conductor and comprises an insulating body, preferably of vitreous material, and coupling for connecting base and conductor clamps with the insulator, without decreasing the effective flash-over value thereof. By my improvements, stresses are transmitted directly from a coupling to an integral part of the insulator forming a bearing surface normal to or intersecting the linesof force, and the need of cement or adhesives for securing the couplings to the insulator is obviated.

In accordance with my invention, an insulator, preferably moulded from porcelain by the wet process and having a height equal to the desired flash-over value, has set therein couplings so positioned that the open path between them is equal to or longer than the flash-over distance between the insulator ends.

One or both of the couplings has a detachable head seated in a groove or channel extending transversely to the height of the insulator, and a shank or stem, connected withsuch head, extends through a bore or channel leading from the groove to the end of the insulator for the engagement thereto of a base or conductor clamp. When the insulator is formed of porcelain or other vitrifiable material, the coupling channels are preferably formed before baking'and the coupling members inserted after baking and cooling of the insulator.

The characteristic features and advantages of my improvements will further appear from the following description andthe accompanying drawings illustrating embodiments of my invention.

In the drawings, Fig. 1 is a longitudinal sectional view of a form of my improved supvention; and Fig. 7 is alongitudinal sectional View of a further form of device embodying my invention.

As illustrated in Figs. 1 to 4, inclusive, a vitreous insulator 1, having its periphery 2 corrugated to increase the creepage surface, has a flash-over height measured by the distance between its end surfaces 3 and 4.

The insulator is preferably formed of wet process porcelain. to afford maximum resistance to electric and atmospheric conditions but may be formed of other suitable dielectric substances.

Radial slots 5, 5', transverse to the height of the insulator, extend inwardly from oppo-. site sides of its periphery toward the center thereof. Axial bores 6, 6 extend from the respective ends 3 and 4 toward one another and respectively intersect the slots 5, 5'. The

apertures 5, 5, 6, 6' are preferably cut in the insulator after moulding and before baking when the insulators are made of wet process porcelain, but may be formed during die casting when a fluid dielectric is used for making the insulator.

The insulators have suitable base and busconductor clamps 7, 7 secured thereto by couplings comprising nuts or heads 8 held against turning by the engagement of their flat sides with the side walls of the slot and containing threaded sockets for the reception of'threaded shanks or stems of bolts 9 having heads engaging the clamps. A cushioning washer 10 may be inserted between the insulator and one or both clamps.

The heads 8 are dropped into the slots 5, 5 and the bolt shanks 9 are passed through the clamps and bores 6, 6 and screwed into the sockets of the heads. After the assembly of the parts, the insulator apertures may be filled with a sealing wax or other non-conducting filler to exclude moisture and dirt. It will be observed that the stresses are transmitted directly to integral portions of the insulator through bearing surfaces of the grooves 5, 5 intersecting the lines of force; the couplings are accurately positioned without the use of jigs and firmly secured without the use of cement; and the flash-over value of the insulator is not diminished because the path from one head 8, through the roove 5, around half the circumference o the insulator and through the groove 5 to the other head 8 is considerably longer than the distance between the ends 3 and 4.

In the form of the device shown in Fig. 5, the grooves 5a and 5a extend entirely through the insulator at right angles to one another and a lock washer 11 is inserted between one of the heads 8 and the porcelain wall transverse thereto. As the distance from one nut- 8 to the other through the grooves 5a and 5a and part way round the circumference of the insulator is greater than the height of the insulator, there is no diminution of flash-over value.

. the device,

Fig. 6 illustrates the provision of a plurality of couplings at one end of the insulator. In this form of the device, the groove 5a is separated by a barrier 1a into several sections each containing a head 8 andcommunlcating with a bore 6a leading to the end 3 for the passage of a stem 9. The opposite end of the insulator cont'ains channels 5av and 6 with the coupling members '8 and 9 therein similar to the showing in Fig. 5. The bores 6a and 6' may be extended slightly beyond the grooves 5a, 5a to formrecesses 12 permitting the stems of the bolts 9 to be screwed slightly past the inner surfaces of the heads 8. In this construction also the distance from either head8 in the channel 5a to the head 8 in the channel 5a is equal to or greater than theflash-over height between the ends 3 and 4.

In the form shown in Fig. 7 one end -of the insulator 1 contains channels 5', 6 containing coupling members 8 and 9, similarto 15. The thimble contains a threaded hole 16 for the reception of a clamp bolt. The

groove 5 is shown filled with sealing wax.

As in the other figures, the electrical path between the coupling member 15 and the coupling 8, 9 is equal to or greater than the height of the insulator, hence there is no sacrifice of flash-over value.

It will be understood that the details or modifications indicated by the numerals 10, 11, 12, 13, 14, 15 and 16 are a plicable to the several forms of the device. 7 11 each form of the distance which the couplings penetrate axially within the insulator is compensated for by the distance between the couplings and the periphery of the insulator, so that the flash-over distance between couplings is never less than the flash-over value determined by the height of the insulator, or the distance between its'ends.

Having described my invention, I claim:

- 1. A bus conductor support comprising an insulator having separate channels extending from opposite sides into and slightly beyond the center of said insulator, channels communicating with said channels first named and adapted to accommodate coupling members which are secured by nuts located in said first named channels.

2. A bus conductor support comprising an insulator body having a channel extending radially from the outer periphery thereof toward the interior and a channel forming an opening in an end of said body and communicating with the channel first named, and coupling means comprising a detachable head seated in said first channel and a shank-disposed in said second channel, the flash over distance between said head and the plane of the end of said body opposite said first named end being no less than the flash over distance between the planes of the ends of said body.

In testimony whereof I have hereunto set my name this 25th day of August, 1925.

WALTER S. MAYER. 

